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This is important because the complication rate after surgery has been reported to be nearly 4 times higher if the dura is opened during surgery. People of all ages can develop these tumors. buy viagra Very severe Chiari malformations may be life threatening. They are generally categorized as either schwannomas or neurofibromas. buy viagra Some types of Chiari malformations may require surgery to relieve increased pressure inside the head or neck area, or to help drain excess cerebral spinal fluid from the brain. Nerve sheath tumors account for about 25 percent of intradural spinal cord tumors located within the membrane surrounding the cord in adults. buy viagra Genetic counseling may be recommended by the physician to provide information on the recurrences for Chiari malformation and any available testing. Nerve sheath tumors Nerve sheath tumors arise from the cells that surround nerves. buy viagra In addition, the use of endoscopes has allowed for this procedure to be performed through smaller incisions, which helps in the reduction of post operative pain and speech recovery. Most are single schwannomas that can arise anywhere within the spine canal.